1. 2
Chapter
Chapter 2
Integers and Introduction to Variables

2. Introduction to Integers
Section
2.2
Introduction to Integers

3. Represent Real-Life Situations with Integers
Objective A
Represent Real-Life Situations with Integers

4. Definitions Positive Numbers: Numbers greater than 0.
Negative Numbers: Numbers that are less than 0.
Objective A Continued

5. Example
Example
A worker in a silver mine in Nevada works 1445 feet underground. Write this as a signed number.
1445 feet underground = –1445
Objective A Continued

6. Graph Integers on a Number Line.
Objective B
Graph Integers on a Number Line.

7. Graphing Integers Example
Graph the following integers on a number line:
Objective B

8. Objective C
Compare Integers.

9. Comparing Integers Comparing Integers
For any two numbers graphed on a number line, the number to the right is the greater number, and the number to the left is the smaller number. Also recall that the symbol > means “is greater than” and the symbol < means “is less than”.
Objective A 9

10. Example
Example
Insert < or > between each pair of numbers to make a true statement.
a. −6 ____ 3 b. c.
<
>
Objective A
> 10

11. Find the Absolute Value of a Number.
Objective D
Find the Absolute Value of a Number.

12. Absolute Value Example
The absolute value of a number is the number’s distance from 0 on a number line. The symbol for absolute value is | |.
Find each absolute value. a. b. c.
Objective A 12

13. Find the Opposite of a Number.
Objective E
Find the Opposite of a Number.

14. Finding the Opposite of a Number
Opposites
Two numbers that are the same distance from 0 on the number line but are on opposite sides of 0.
Objective E

15. Example Example Find the opposite of each number. a. 11 b. ‒8 c. 0
a. The opposite of 11 is ‒11.
b. The opposite of ‒8 is 8.
c. The opposite of 0 is 0.
Objective D

16. Example
Example
Simplify. a. b. c.
= –9
Objective A 16

17. Read Bar Graphs Containing Integers.
Objective F
Read Bar Graphs Containing Integers.

18. Reading Bar Graphs Containing Integers
Example
Which planet has the lowest average temperature?
Objective F
Neptune

19. Example
Example
According to the bar graph, which planet has the third lowest average temperature?
The bar with the third lowest temperature is Saturn with a lowest average temperature of
Objective A 19